TB3 + 2 * I16 = SPB flight

SPB (sostavnoy pikiruyuschiy bombardirovschik = the composite dive bomber) of USSR.
Soviet TB-3 4-engined bomber carried a pair of I-16 fighters (armed with a pair of 250kg bombs each).
All 6 engines worked together using the fuel tanks of the TB-3. Tthe TB-3 gives own long-range to the symbiosis, the
little I-16 leaves him not far from a target and performs fast and unespected strike.
Total weight = 22 t, speed 260kmph.

Triple warplane SPB was successfully used in combat by 32 iap of Russian Blacksea fleet
in august-october 1941. WWII photo.